Inclined waved board and heat exchanger thereof

ABSTRACT

An inclined waved board and a heat exchanger thereof. The inclined waved board includes a board body composed of continuous waved sections. The waved sections are respectively inclined from a first side to a second side, and a third side and from a fourth side to the second side of the board body. The waved sections define multiple raised sections and recessed sections on two faces of the board body. The heat exchanger is composed of multiple board bodies arranged adjacent to and in parallel to each other. Each two adjacent board bodies define therebetween a flow way. The inclined waved sections enhance turbulence intensity and guide the fluids to produce secondary flows along the cross-sections of the flow ways to form dynamic three-dimensional swirling flow structures which combine to augment heat transfer rates with reduced pressure-drop.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a division of U.S. patent application Ser. No. 12/465,004, filed on May 13, 2009, titled Inclined Waved Board and Heat Exchanger Thereof, listing Shyy Woei Chang and Kuei-Feng Chaing as inventors.

FIELD OF THE INVENTION

The present invention relates to an inclined waved board and a heat exchanger thereof. The inclined waved board includes a board body composed of continuous waved sections inclined by an inclination. The heat exchanger is composed of multiple board bodies arranged adjacent to and in parallel to each other.

BACKGROUND OF THE INVENTION

A heat exchanger is used to transfer heat from one space to another space. In general, heat is transferred in three manners, that is, conduction, convection and radiation. The heat exchanger often transfers heat by means of all the three measures. However, in accordance with different situations, one of the three measures is often the major measure for transferring heat. An industrial heat exchanger transfers heat mainly in such a manner that the heat is conducted or transferred through heat pipes from a hot radiating fin area to a cold radiating fin area. In such process, the heat is transferred by way of both thermal convection and heat conduction as a basic principle of heat transfer of heat exchanger.

Taiwanese Patent Application No. 094216086 discloses a flow direction and flow distribution structure of heat exchanger. The structure includes a first flow direction heat transfer board having multiple rib sections disposed on a surface of the first flow direction heat transfer board. The rib sections obliquely oppositely extend from two sides of the first flow direction heat transfer board to the middle thereof. That is, the rib sections form a V-shaped structure, which is directed upstream.

In practice, such structure has some defects. The surface ribs create considerable heat transfer variations in both streamwise and spanwise directions and undermine the uniformity of heat transfer rates over the ribbed surface. The non-uniformity in heat transfer distributions increases thermal stresses.

Furthermore, the surfaces of the rib sections are artificially roughened so that the pressure loss coefficient of the prior art is relatively high.

SUMMARY OF THE INVENTION

A primary object of the present invention is to provide an inclined waved board and a heat exchanger thereof. The inclined waved board includes a board body composed of continuous waved sections. The waved sections are inclined from a first side of the board body to a second side thereof by an inclination. The heat exchanger is composed of multiple board bodies arranged adjacent to and in parallel to each other. The waved sections of the adjacent board bodies are aligned with each other to define multiple waved flow ways. The fluids flowing through the waved flow ways form a dynamic three-dimensional swirling flow structure in the waved flow ways so as to enhance heat transfer performance.

A further object of the present invention is to provide the above inclined waved board and heat exchanger, in which when the fluids flow through the waved flow ways, the inclined waved sections guide the fluids to produce secondary flows along the cross-sections of the flow ways.

A still further object of the present invention is to provide the above inclined waved board and heat exchanger, in which the flow ways include multiple odd flow ways and multiple even flow ways. A first fluid flows through the odd flow ways, while a second fluid flows through the even flow ways.

To achieve the above and other objects, the inclined waved board of the present invention includes a board body composed of continuous waved sections. The board body has a first side and a second side. The waved sections are inclined from the first side to the second side by an inclination to define multiple raised sections and recessed sections on two faces of the board body. The heat exchanger is composed of multiple board bodies arranged adjacent to and in parallel to each other to form the heat exchanger as an integrated body. Each two adjacent board bodies define therebetween a flow way. The raised sections and recessed sections of a face of one board body are aligned with the raised sections and recessed sections of an opposite face of an adjacent board body, whereby the flow ways are waved. The flow ways include multiple odd flow ways and multiple even flow ways. A first fluid flows through the odd flow ways, while a second fluid flows through the even flow ways.

BRIEF DESCRIPTION OF THE DRAWINGS

The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:

FIG. 1 is a perspective view of a preferred embodiment of the board body of the present invention;

FIG. 2 is a front view of the preferred embodiment of the board body of the present invention;

FIG. 3 is a perspective view of the heat exchanger composed of multiple board bodies of the present invention;

FIG. 4A shows the flow ways of the present invention in one aspect;

FIG. 4B shows the flow ways of the present invention in another aspect; and

FIG. 5 is a perspective view of the heat exchanger of the present invention, showing that fluids flow through the heat exchanger.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 1 and 2. The inclined waved board of the present invention includes aboard body 11 composed of continuous waved sections 12. The board body 11 has a first side 13, a second side 14, a third side 15 and a fourth side 16. The first side 13 is opposite to the second side 14. The third side 15 is opposite to the fourth side 16 and interconnected between the first side 13 and the second side 14.

The waved sections 12 are respectively inclined from the first side 13 to the second side 14 and inclined from the first side 13 to the third side 15 and inclined from the fourth side 16 to the second side 14 by an inclination. (The inclination is less than or more than 90 degrees and preferably 45 or 135 degrees.) The waved sections 12 define multiple raised sections 121 and recessed sections 122 formed on double faces of the board body 11.

Referring to FIG. 3, multiple board bodies 11 are arranged adjacent to and in parallel to each other to form a heat exchanger 10 as an integrated body. Each two adjacent board bodies 11 define therebetween a flow way a1˜a8. The raised sections 121 and recessed sections 122 of a face of one board body 11 are aligned with the raised sections 121 and recessed sections 122 of an opposite face of a next board body 11 (as shown in FIG. 4A), whereby the flow ways a1˜a8 are waved.

It should be noted that FIG. 4A is for illustrative purposes only, not intended to limit the scope of the present invention. Alternatively, the raised sections 121 and recessed sections 122 of a face of one board body 11 are aligned with the recessed sections 122 and raised sections 121 of an opposite face of a next board body 11 as shown in FIG. 4B, whereby the flow ways a1˜a8 are also waved.

The waved flow ways include odd flow ways a1, a3, a5, a7 and even flow ways a2, a4, a6, a8.

Referring to FIGS. 2 and 5, a first fluid 17 flows from the first side 13 of the odd flow ways a1, a3, a5, a7 to the second side 14. The third and fourth sides 15, 16 of the odd flow ways a1, a3, a5, a7 are closed. A second fluid 18 flows from the third side 15 of the even flow ways a2, a4, a6, a8 to the fourth side 16. The first and second sides 13, 14 of the even flow ways a2, a4, a6, a8 are closed. The first fluid 17 is one of a hot fluid and a cold fluid. The second fluid 18 is the other of the hot fluid and cold fluid. The first and second fluids 17, 18 flowing through the flow ways will form separate flows at the peaks of the raised sections 121 so as to produce shear layers and enhance turbulence intensity. Moreover, a dynamic three-dimensional swirling flow structure is formed in the waved flow ways a1˜a8 to enhance heat transfer performance.

Furthermore, the 45-degree inclined waved flow ways a1˜a8 serve to guide the first and second fluids 17, 18 to produce secondary flows over the cross-sectional planes of the flow ways through the entire flow passage. For example, in FIG. 5, the first fluid 17 flows into the heat exchanger from the first side 13. The fluid flowing through the undulant surfaces with inclined surface waves are guided by the waved sections 12 to flow along the inclined surface wave to produce the secondary flows. The second fluid 18 flows into the heat exchanger from the third side 15. The fluid flowing through the undulant surfaces with inclined surface waves are guided by the waved sections 12 to flow along the inclined surface wave to produce the secondary flows. In the above embodiment, the third and fourth sides 15, 16 of the odd flow ways a1, a3, a5, a7 are closed and the first and second sides 13, 14 of the even flow ways a2, a4, a6, a8 are closed. Alternatively, the third and fourth sides 15, 16 of the odd flow ways a1, a3, a5, a7 are closed and the third and fourth sides 15, 16 of the even flow ways a2, a4, a6, a8 are closed. Still alternatively, the third side 15 or the fourth side 16 of the odd flow ways a1, a3, a5, a7 is closed and the first side 13 or the second side 14 of the even flow ways a2, a4, a6, a8 is closed. Still alternatively, the first and second sides 13, 14 of the odd flow ways a1, a3, a5, a7 are closed and the third and fourth sides 15, 16 of the even flow ways a2, a4, a6, a8 are closed. Still alternatively, the first side 13 or the second side 14 of the odd flow ways a1, a3, a5, a7 is closed and the third side 15 or the fourth side 16 of the even flow ways a2, a4, a6, a8 is closed. By means of different closed patterns, the first fluid 17 and the second fluid 18 are respectively controlled to flow through the odd flow ways a1, a3, a5, a7 and the even flow ways a2, a4, a6, a8 in different incoming and outgoing directions. Also, the board bodies 11 can be connected with each other to form an integrated body.

Moreover, two surfaces of each of the flow ways a1˜a8 are smooth faces so that they have lower pressure loss coefficient than the prior art.

The present invention has been described with some preferred embodiments thereof and it is understood that many changes and modifications in the described embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims. 

1-5. (canceled)
 6. An inclined waved board heat exchanger comprising multiple board bodies arranged adjacent to and in parallel to each other to form the heat exchanger as an integrated body, each of the board bodies being composed of continuous waved sections, the board body having a first side and a second side, the waved sections being inclined from the first side to the second side by an inclination to define multiple raised sections and recessed sections on two faces of the board body, each two adjacent board bodies defining therebetween a flow way; wherein the raised sections and recessed sections of a face of one board body are aligned with the recessed sections and raised sections of an opposite face of an adjacent board body, whereby the flow ways are waved.
 7. The inclined waved board heat exchanger as claimed in claim 6, wherein the inclination is less than or more than 90 degrees.
 8. The inclined waved board heat exchanger as claimed in claim 6, wherein the inclination is 45 or 135 degrees.
 9. The inclined waved board heat exchanger as claimed in claim 6, wherein the raised sections and recessed sections of a face of one board body are aligned with the raised sections and recessed sections of an opposite face of an adjacent board body, whereby the flow ways are waved.
 10. (canceled)
 11. The inclined waved board heat exchanger as claimed in claim 6, wherein the flow ways include multiple odd flow ways and multiple even flow ways.
 12. The inclined waved board heat exchanger as claimed in claim 11, wherein a first fluid flows through the odd flow ways, while a second fluid flows through the even flow ways.
 13. The inclined waved board heat exchanger as claimed in claim 12, wherein the first fluid is one of a hot fluid and a cold fluid, while the second fluid is the other of the hot fluid and cold fluid.
 14. The inclined waved board heat exchanger as claimed in claim 6, wherein the board body further has a third side and a fourth side, the third and fourth sides being interconnected between the first and second sides, the third side being opposite to the fourth side, the waved sections being respectively inclined from the first side to the third side and inclined from the fourth side to the second side.
 15. The inclined waved board heat exchanger as claimed in claim 7, wherein the board body further has a third side and a fourth side, the third and fourth sides being interconnected between the first and second sides, the third side being opposite to the fourth side, the waved sections being respectively inclined from the first side to the third side and inclined from the fourth side to the second side.
 16. The inclined waved board heat exchanger as claimed in claim 8, wherein the board body further has a third side and a fourth side, the third and fourth sides being interconnected between the first and second sides, the third side being opposite to the fourth side, the waved sections being respectively inclined from the first side to the third side and inclined from the fourth side to the second side.
 17. The inclined waved board heat exchanger as claimed in claim 14, wherein the third side and/or the fourth side of the odd flow ways are closed and the third side and/or the fourth side of the even flow ways are closed.
 18. The inclined waved board heat exchanger as claimed in claim 14, wherein the third side and/or the fourth side of the odd flow ways are closed and the first side and/or the second side of the even flow ways are closed.
 19. The inclined waved board heat exchanger as claimed in claim 14, wherein the first side and/or the second side of the odd flow ways are closed and the third side and/or the fourth side of the even flow ways are closed.
 20. The inclined waved board heat exchanger as claimed in claim 14, wherein the first side and/or the second side of the odd flow ways are closed and the first side and/or the second side of the even flow ways are closed. 